Studies on the Stability constants of complexes between rare earth elements and ethylenediaminediacetic acid
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2001, v.14 no.4, pp.371-375
Cha, Ki-Won
Hyun, In-Seong
Choi, Hyun-Chol
Cha,
K., Hyun,
I., &
Choi,
H.
(2001). Studies on the Stability constants of complexes between rare earth elements and ethylenediaminediacetic acid. , 14(4), 371-375.
Abstract
The stability constants of complexes between rare earth elements(Yb, Dy, Sm, Nd, Pr, Ce, La) and ethylenediaminediacetic acid(EDDA) have been measured for the separation of rare earth elements by potentiometric method. The $pk_1s$ of $MA^+$ complexes are in the range of 8.80-6.72 and the $pk_2s$ of $MA_2^-$ complexes are in the range of 7.43-4.37. The magnitude sequences of the stability constants are the reverse of the ionic size of rare earth elements.
- keywords
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stability constants,
rare earth elements,
ethylenediaminedi aceticacid